| 摘要 |
<p>A pressure compensating valve comprising: a check valve portion having an inlet port connected to a discharge path of a hydraulic pump, an outlet port connected to an input side of a directional control valve and a valve for controlling an opening area between the two ports; and a pressure reducing valve portion having a spool having in turn first and second pressure chambers formed on sides thereof, respectively, and adapted to slide by virtue of its own load pressure supplied into the first pressure chamber in one direction in which it allows the valve to slide in a direction in which the opening area is increased and to slide by virtue of the pressure inside the second pressure chamber in the other direction in which it pushes the valve in a direction in which the opening area is decreased, an internal passageway formed inside the spool for supplying the discharged pressure oil of the hydraulic pump into the second pressure chamber when the spool slides over a predetermined distance in one direction, a first restrictor provided in the internal passageway, and another port for establishing communication between the first restrictor and a load pressure detecting path connected to a tank via a second restriction.</p> |
